Posted by: Pdfprep
Post Date: November 23, 2020
Refer to the exhibit.
After configuring GRE between two routers running OSPF that are connected to each other via a WAN link, a network engineer notices that the two routers cannot establish the GRE tunnel to begin the exchange of routing updates.
What is the reason for this?
A . Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 47.
B . Either a firewall between the two routers or an ACL on the router is blocking UDP 57.
C . Either a firewall between the two routers or an ACL on the router is blocking TCP 47.
D . Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 57.
Answer: A
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